1. Committee on Support for Thinking Spatially. Learning to think spatially. Washington D.C.: National Research Council; 2006.
2. Landscape landschaft;Cosgrove;German Historical Institute Bulletin,2004
3. J. The spatial economy: Cities, regions and international trade;Fujita,2001
4. Toward critical spatial thinking in the social sciences and humanities;Goodchild;GeoJournal,2010
5. Goodchild M. The fourth R, ESRI ArcNews, Fall 2006; http://www.esri.com/news/arcnews/fall06articles/the-fourth-r.html.